This is a Dimmable 21w LED Golfball with a ES cap (E27) in colour 2700K ( extra warm white). It is designed to replace a 150w incandescent type lamp while maintaining the low energy consumption of LED. These lamps have an average life of 25,000 hours which equal well over 15 years of use based on the average household use. They have an extremely high lumen output of 2452. Warm up time is a mere 0.5s and is capable of 100,000 switch cycles. It is advised that dimmable led lamps are used with a trailing edge dimming switch to ensure smooth and silent dimming. Physical dimensions are: L 143mm x D 67mm. 4 Year Warranty Included.